保留MySQL自动递增的ID?
要保留MySQL自动递增的ID,语法如下-
START TRANSACTION;insert into yourTableName values(),(),(),();
ROLLBACK;
SELECT LAST_INSERT_ID() INTO @anyVariableName;
为了理解上述语法,让我们创建一个表。创建表的查询如下-
mysql> create table reservingAutoIncrementDemo-> (
-> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY
-> );
使用insert命令在表中插入一些记录。查询如下-
mysql> START TRANSACTION;mysql> insert into reservingAutoIncrementDemo values(),(),(),();
Records: 4 Duplicates: 0 Warnings: 0
mysql> select *from reservingAutoIncrementDemo;
+--------+
| UserId |
+--------+
| 1 |
| 2 |
| 3 |
| 4 |
+--------+
4 rows in set (0.00 sec)
mysql> rollback;
这是保留MySQL auto_incremented ID的查询-
mysql> SELECT LAST_INSERT_ID() INTO @IncrementedValue;
让我们检查保留的auto_incremented值。查询如下-
mysql> select @IncrementedValue;
这是输出-
+-------------------+| @IncrementedValue |
+-------------------+
| 1 |
+-------------------+
1 row in set (0.00 sec)
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